java 获取当前程序的进程ID

public static int getPid() {
    RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
    String name = runtime.getName(); // format: "pid@hostname"
    try {
        return Integer.parseInt(name.substring(0, name.indexOf('@')));
    } catch (Exception e) {
        return -1;
    }
}